Welcome to MEPIS , its the best!
Ok basics first...
how much ram have you got? Your tower can hold maximum of two banks of pc 133 @ 128mb each. So hopefully you have the maximum amount of ram which is 256mb.
Sorry to tell you the computer is not very new, whoever told you it was newish was either uninformed or was feeding you a story as pc133 ram is pretty ancient. Antix should do fine.
What size and type is your monitor?
To achieve the resolution.....
the easiest way is to use sgfxi. Sgfxi will set up your resolution faster and easier than any other way. I always use sgfxi.
Go to the wiki and type in sgfxi in the searchbar or click the link below....Click here to go to the wiki page on sgfxi
Next question is what do you have for graphics? Are you using the onboard video or do you have a pci graphics card of some sort. The best would probably be to pick up a used ati graphics card that has about 256mb of ram on the card, maybe even a 512mb card but doubt if the tower can push a bigger card without overtaxing the power supply.
The ram on the vid card will really help a set up like yours.
Whenever I pick up an older computer I check the tower model out at crucial.com
to see how much ram it can use.
Older computers with pentium 3 cpu's can sometimes hold 1 or 2 gb of ram. These older computers can be very fast with the maximum amount of ram installed.
I prefer building computers but re-furbishing an older computer with ram is always a good inexpensive option.
Anyways make sure you have the maximum amount of ram. Your type of ram is not expensive at all. You need two 128mb sticks of pc133 ram. If you can buy two new sticks, this is the type you need.....
Part #: CT174497 â€¢ SDRAM, PC133 â€¢ CL=3 â€¢ Unbuffered â€¢ Non-parity â€¢ 133MHz â€¢ 3.3V â€¢ 16Meg x 64
You may already know how to safely install ram but for those that don't here is a link to a good page that explains how to install ram.Click Here to learn how to install ram in your personal computer.
then go to the wiki page I left the link to and install sgfxi. Its pretty easy.